SQL处理表结构的基本方法整理(创建表,关联表,复制表)
復(fù)制表結(jié)構(gòu)及數(shù)據(jù)到新表
CREATE TABLE 新表 SELECT * FROM 舊表只復(fù)制表結(jié)構(gòu)到新表
CREATE TABLE 新表 SELECT * FROM 舊表 WHERE 1=2即:讓W(xué)HERE條件不成立.
方法二:(由tianshibao提供)
CREATE TABLE 新表 LIKE 舊表
復(fù)制舊表的數(shù)據(jù)到新表(假設(shè)兩個(gè)表結(jié)構(gòu)一樣)
INSERT INTO 新表 SELECT * FROM 舊表復(fù)制舊表的數(shù)據(jù)到新表(假設(shè)兩個(gè)表結(jié)構(gòu)不一樣)
INSERT INTO 新表(字段1,字段2,.......) SELECT 字段1,字段2,...... FROM 舊表 如果是 SQL SERVER 2008 復(fù)制表結(jié)構(gòu),使用如下方法:在表上面右擊——編寫(xiě)表腳本為:——Create到——新查詢編輯器窗口,你也可以保存為sql文件,
新查詢編輯器窗口的話在最上面一條把use databasename改成你要復(fù)制過(guò)去的數(shù)據(jù)庫(kù)名稱
如果遇到:
IDENTITY_INSERT 設(shè)置為 OFF 時(shí),不能向表 ‘id’ 中的標(biāo)識(shí)列插入顯式值。
插入數(shù)據(jù)的時(shí)候不要為id列指定值,也就是
insert into table ( …)語(yǔ)句中,括號(hào)中的字段中不要包含id列。
說(shuō)明:復(fù)制表(只復(fù)制結(jié)構(gòu),源表名:a 新表名:b)
SQL: select* into b from a where 1<>1說(shuō)明:拷貝表(拷貝數(shù)據(jù),源表名:a 目標(biāo)表名:b)
SQL: insert into b(a, b, c) select d,e,f from b;其他說(shuō)明
說(shuō)明:顯示文章、提交人和最后回復(fù)時(shí)間
SQL: selecta.title,a.username,b.adddate fromtable a,(selectmax(adddate) adddate fromtable wheretable.title=a.title) b說(shuō)明:外連接查詢(表名1:a 表名2:b)
SQL: selecta.a, a.b, a.c, b.c, b.d, b.f froma LEFT OUT JOIN b ON a.a = b.c說(shuō)明:日程安排提前五分鐘提醒
SQL: select* from 日程安排 where datediff('minute',f開(kāi)始時(shí)間,getdate())>5說(shuō)明:兩張關(guān)聯(lián)表,刪除主表中已經(jīng)在副表中沒(méi)有的信息
SQL:
delete from info wherenot exists ( select* from infobz where info.infid=infobz.infid )說(shuō)明:–
SQL:
SELECT A.NUM, A.NAME, B.UPD_DATE, B.PREV_UPD_DATEFROM TABLE1,(SELECT X.NUM, X.UPD_DATE, Y.UPD_DATE PREV_UPD_DATEFROM (SELECT NUM, UPD_DATE, INBOUND_QTY, STOCK_ONHANDFROM TABLE2WHERE TO_CHAR(UPD_DATE,'YYYY/MM') = TO_CHAR(SYSDATE,'YYYY/MM')) X,(SELECT NUM, UPD_DATE, STOCK_ONHANDFROM TABLE2WHERE TO_CHAR(UPD_DATE,'YYYY/MM') =TO_CHAR(TO_DATE(TO_CHAR(SYSDATE,'YYYY/MM') ||'/01','YYYY/MM/DD') - 1,'YYYY/MM') ) Y,WHERE X.NUM = Y.NUM (+)AND X.INBOUND_QTY + NVL(Y.STOCK_ONHAND,0) <> X.STOCK_ONHAND ) BWHERE A.NUM = B.NUM說(shuō)明:–
SQL:
select* from studentinfo where not exists(select * from studentwhere studentinfo.id=student.id) and 系名稱='"&strdepartmentname&"'and 專業(yè)名稱='"&strprofessionname&"'order by 性別,生源地,高考總成績(jī)說(shuō)明:
從數(shù)據(jù)庫(kù)中去一年的各單位電話費(fèi)統(tǒng)計(jì)(電話費(fèi)定額賀電化肥清單兩個(gè)表來(lái)源)
SQL:
SELECT a.userper, a.tel, a.standfee, TO_CHAR(a.telfeedate,'yyyy') AS telyear,SUM(decode(TO_CHAR(a.telfeedate,'mm'), '01', a.factration)) AS JAN,SUM(decode(TO_CHAR(a.telfeedate,'mm'), '02', a.factration)) AS FRI,SUM(decode(TO_CHAR(a.telfeedate,'mm'), '03', a.factration)) AS MAR,SUM(decode(TO_CHAR(a.telfeedate,'mm'), '04', a.factration)) AS APR,SUM(decode(TO_CHAR(a.telfeedate,'mm'), '05', a.factration)) AS MAY,SUM(decode(TO_CHAR(a.telfeedate,'mm'), '06', a.factration)) AS JUE,SUM(decode(TO_CHAR(a.telfeedate,'mm'), '07', a.factration)) AS JUL,SUM(decode(TO_CHAR(a.telfeedate,'mm'), '08', a.factration)) AS AGU,SUM(decode(TO_CHAR(a.telfeedate,'mm'), '09', a.factration)) AS SEP,SUM(decode(TO_CHAR(a.telfeedate,'mm'), '10', a.factration)) AS OCT,SUM(decode(TO_CHAR(a.telfeedate,'mm'), '11', a.factration)) AS NOV,SUM(decode(TO_CHAR(a.telfeedate,'mm'), '12', a.factration)) AS DECFROM (SELECT a.userper, a.tel, a.standfee, b.telfeedate, b.factrationFROM TELFEESTAND a, TELFEE bWHERE a.tel = b.telfax) aGROUP BY a.userper, a.tel, a.standfee, TO_CHAR(a.telfeedate,'yyyy')說(shuō)明:四表聯(lián)查問(wèn)題:
SQL: select * froma left inner joinb on a.a=b.b right inner join c on a.a=c.c innerjoin d on a.a=d.d where .....說(shuō)明:得到表中最小的未使用的ID號(hào)
SQL:
SELECT (CASE WHEN EXISTS(SELECT * FROM Handle b WHERE b.HandleID = 1) THEN MIN(HandleID) + 1 ELSE 1 END)as HandleIDFROM HandleWHERE NOT HandleID IN (SELECT a.HandleID - 1 FROM Handle總結(jié)
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